noaa-ocean-22950 Grimsey, North Icelandic Shelf Annual d13C Data over the Last Millennium Reynolds, D.J.; Hall, I.R.; Scourse, J.D.; Richardson, C.A.; Wanamaker, A.D.; Butler, P.G. Grimsey, North Icelandic Shelf Annual d13C Data over the Last Millennium 2017-11-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22950 Investigator D.J. Reynolds Investigator I.R. Hall Investigator J.D. Scourse Investigator C.A. Richardson Investigator A.D. Wanamaker Investigator P.G. Butler earth science paleoclimate paleocean carbon isotopes geoscientificInformation 953 AD 2000 AD 997 cal yr BP -50 cal yr BP Complete 66.5265 66.5265 -18.195667 -18.195667 -80 -80 Ocean Atlantic Ocean North Atlantic Ocean Grimsey, North Icelandic Shelf>LATITUDE 66.5265>LONGITUDE -18.195667 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Reynolds, D.J., Hall, I.R., Scourse, J.D., Richardson, C.A., Wanamaker, A.D., and Butler, P.G. 2017 Global Biogeochemical Cycles 31 1718-1735 10.1002/2017GB005708

Given the rapid increase in atmospheric carbon dioxide concentrations (pCO2) over the industrial era there is a pressing need to construct long term records of natural carbon cycling prior to this perturbation and to develop a more robust understanding of the role the oceans play in the sequestration of atmospheric carbon. Here we reconstruct the historical biological and climatic controls on the carbon isotopic (d13C-shell) composition of the North Icelandic shelf waters over the last millennium derived from the shells of the long-lived marine bivalve mollusc Arctica islandica. Variability in the annually resolved d13C-shell record is dominated by multi-decadal variability with a negative trend (-0.003 ± 0.002‰ yr-1) over the industrial era (1800-2000 CE). This trend is consistent with the marine Suess effect brought about by the sequestration of isotopically light carbon (d13C of CO2) derived from the burning of fossil fuels. Comparison of the d13C-shell record with contemporary proxy archives, over the last millennium, and instrumental data over the 20th century, highlight that both biological (primary productivity) and physical environmental factors such as relative shifts in the proportion of Subpolar Mode Waters and Arctic Intermediate Waters entrained onto the North Icelandic shelf, atmospheric circulation patterns associated with the winter North Atlantic Oscillation, and subpolar gyre sea surface temperatures and salinity, are the likely mechanisms that contribute to natural variations in seawater d13C variability on the North Icelandic shelf. Contrasting d13C fractionation processes associated with these biological and physical mechanisms likely cause the attenuated local marine Suess effect signal at this locality. STUDY NOTES: Precision of d13C measurements: 0.05 per mil Provided Keywords: Arctica islandica, annually-resolved, absolutely-dated, North Atlantic, Iceland, carbon isotopes, d13C

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reynolds2017b/reynolds2017b-grim.txt NOAA Template File; Grimsey d13C Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11